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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jan-26-2012, 02:58:05 PM   #11
Kross
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Default Re: Idle Drop Issue..

Do you always get fuel from the same gas station?

I have idle dips whenever I get fuel from this one sh*tty gas station. Since I've stopped going there...no more idle problems.

If it's intermittent, check to see if it comes and goes with different fillups.
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Old Thu, Jan-26-2012, 03:02:00 PM   #12
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Default Re: Idle Drop Issue..

Posted in a similar thread. My issue is IDENTICAL to the OP but is a little more severe and if I don't throttle it, the car can choke itself and die. Like the OP, this only happens when it's cold and vanishes after about 60 seconds of driving. Maybe less.
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Old Thu, Jan-26-2012, 04:03:50 PM   #13
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Default Re: Idle Drop Issue..

Quote:
Originally Posted by AggieEvan View Post
Posted in a similar thread. My issue is IDENTICAL to the OP but is a little more severe and if I don't throttle it, the car can choke itself and die. Like the OP, this only happens when it's cold and vanishes after about 60 seconds of driving. Maybe less.
We aren't alone there is nearly a 100 threads on this topic. On e46Fan. to Bimmerpost.

I've read through them all and no one seems to have the answer to what is wrong.

The only guy who said it got fixed said the dealer replaced the fuel pump and fuel pump relays.
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Old Thu, Jan-26-2012, 04:05:52 PM   #14
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Default Re: Idle Drop Issue..

Yup...how many miles are on your car with the original fuel pump? I know a forum member who had similar issues with idle hiccups and he replaced a ton of stuff: TPS sensors, cleaned the ICV, replaced ignition coils, fuel filter...and finally replaced the fuel pump and it fixed his issue.
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Old Thu, Jan-26-2012, 04:22:56 PM   #15
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Default Re: Idle Drop Issue..

I have 61k and some change right now.

Issue started in the 50k range though.

Many times I've thought it was the fuel pump because of the shrill sound it makes when priming.

This is on Turners Website about fuel pump failures.
"A fuel pump failure in the E46M3 can cause lack of power and a low-RPM stumble. Its a fairly common problem, the problem fades away as the revs build and the engine warms up. It's especially noticeable in the Winter and when the outside temperature is low"

So that sounds like it but at $350 bucks and I only have 61k Idk if it would be wise to replace or just wait for it to finally kick the bucket.
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Old Thu, Jan-26-2012, 04:37:48 PM   #16
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Default Re: Idle Drop Issue..

You don't need to replace the entire fuel pump assembly. You can replace only the fuel pump with a Walbro 255, TRE, Deutschwerks D200, D300, Aeromotive, etc. Pricing starts about $80-160 for a replacement pump.


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Originally Posted by Jtrem View Post
I have 61k and some change right now.

Issue started in the 50k range though.

Many times I've thought it was the fuel pump because of the shrill sound it makes when priming.

This is on Turners Website about fuel pump failures.
"A fuel pump failure in the E46M3 can cause lack of power and a low-RPM stumble. Its a fairly common problem, the problem fades away as the revs build and the engine warms up. It's especially noticeable in the Winter and when the outside temperature is low"

So that sounds like it but at $350 bucks and I only have 61k Idk if it would be wise to replace or just wait for it to finally kick the bucket.
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Old Thu, Jan-26-2012, 04:48:09 PM   #17
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Default Re: Idle Drop Issue..

I know HPF has a replacement pump with a Walbro 255. But the Walbro is smaller than the OEM pump which is why HPF includes a sleeve to make it fit properly.
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Old Thu, Jan-26-2012, 05:25:03 PM   #18
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Default Re: Idle Drop Issue..

Yeah...HPF sells the Walbro 255 (model number GSS-342) fuel pump along with their fancy aluminum sleeve for around $300 (!!!!!). That same fuel pump alone can be bought for $80 and a universal install kit with a foam sleeve is another $15. So all in all, you can get a Walbro GSS342 with installation kit for under $100. Most popular choices for aftermarket fuel pumps will be smaller than the oem pump. Look into the following pumps: Aeromotive 340, Deatschwerks DW300 or DW200, Walbro GSS342, Jayracing, TRE, if you want to replace just the pump.

Quote:
Originally Posted by Jtrem View Post
I know HPF has a replacement pump with a Walbro 255. But the Walbro is smaller than the OEM pump which is why HPF includes a sleeve to make it fit properly.
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Old Thu, Jan-26-2012, 06:25:51 PM   #19
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Default Re: Idle Drop Issue..

Thanks man. Ill probably just replace the pump for piece of mind.

On my drive today I used the A/C since its warm here today. Didn't have the issue once. Strange.
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Old Thu, Jan-26-2012, 07:25:18 PM   #20
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Default Re: Idle Drop Issue..

When was your last valve check/adjust? The cold weather makes me think of the lash, not to mention in the morning, the air pump may still be active. Last time this happened to me, it would jump up and down until I threw a bottle of techron concentrate in the tank.
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Discussing Idle Drop Issue.. in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)